(10-14-2015, 09:13 AM)regbeach Wrote: Here is a zoomed flow pattern from the Oct 6 data I posted.
1. Is she awake during part of this? I think I see repeated sleep flow pattern like at 35 and 34:30.
It looks to me like she is asleep during the zoomed in portion and having obstructive apneas, and is occasionally being aroused enough to breathe a few breaths before obstructive apnea sets in again.
The "Flow" is the instantaneous rate of airflow (in liter per minute) into our lungs (when waveform is above the horizontal axis) and out of our lungs (when below the axis).
During an obstructive apnea the PS is always cycling on and off at the backup respiration rate (8 breaths per minute, one breath cycle per 7.5 seconds).
When there is virtually no Flow even though PS is near 12, her airway is closed so hard that pressure increases of 12 and pressure decreases of 12 are unable to cause airflow into or out of her lungs. She needs higher EPAP to keep the airway open, but EPAP cannot be raised unless IPAP can be raised, and IPAP is already maxed out.
If the Max IPAP were 24 (24 = Max EPAP + Max PS), the EPAP would be free to raise itself up to its Max of 12 whenever it wants. Likewise, if Max IPAP were 24 and if EPAP were already maxed out at 12, PS would be free to raise itself up to its max of 12 (bringing IPAP up to 24) if needed.
Of course, higher pressure would likely cause more leaking, but perhaps a mask liner would adequately solve a leak problem.
I need to use very high pressures, and currently the F10 mask is my favorite, but I cannot use the F10 without using a mask liner to eliminate mask burping/trumpeting and to soften leaks so they are not bothersome. I use RemZzzs.
Quote:4. What are the 3 IPAP lines in the pressure graph? Min IPAP, IPAP and Max. IPAP. They don't seem to correlate with the EPAP up and down movements so the min./max don't seem to be EPAP + PS min/max.
Not sure, but the 3 lines for IPAP seem to act like some sort of short term max, average and min lines, perhaps averaged over a period of a minute or so.
To clearly see what is actually happening with the pressure it would be good to plot a "High Rate Pressure" waveform, if SleepyHead can do that. (Not sure; I use ResScan, which works only with ResMed machines.)
The High Rate Pressure waveform would show the EPAP pressure during EPAP and would show the IPAP pressure during IPAP, and the difference will always be the PS.